From c8a9899c1adc66a0dcf8f9658a1290a41bc70c2a Mon Sep 17 00:00:00 2001 From: Sean Christopherson Date: Mon, 19 Jul 2021 19:21:22 +0800 Subject: [PATCH] i386: acpi: Add SGX EPC entry to ACPI tables The ACPI Device entry for SGX EPC is essentially a hack whose primary purpose is to provide software with a way to autoprobe SGX support, e.g. to allow software to implement SGX support as a driver. Details on the individual EPC sections are not enumerated through ACPI tables, i.e. software must enumerate the EPC sections via CPUID. Furthermore, software expects to see only a single EPC Device in the ACPI tables regardless of the number of EPC sections in the system. However, several versions of Windows do rely on the ACPI tables to enumerate the address and size of the EPC. So, regardless of the number of EPC sections exposed to the guest, create exactly *one* EPC device with a _CRS entry that spans the entirety of all EPC sections (which are guaranteed to be contiguous in Qemu). Note, NUMA support for EPC memory is intentionally not considered as enumerating EPC NUMA information is not yet defined for bare metal. Signed-off-by: Sean Christopherson Signed-off-by: Yang Zhong Message-Id: <20210719112136.57018-20-yang.zhong@intel.com> Signed-off-by: Paolo Bonzini --- hw/i386/acpi-build.c | 22 ++++++++++++++++++++++ 1 file changed, 22 insertions(+) diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c index dfaa47cdc2..f4d6ae3d02 100644 --- a/hw/i386/acpi-build.c +++ b/hw/i386/acpi-build.c @@ -1841,6 +1841,28 @@ build_dsdt(GArray *table_data, BIOSLinker *linker, } #endif + if (pcms->sgx_epc.size != 0) { + uint64_t epc_base = pcms->sgx_epc.base; + uint64_t epc_size = pcms->sgx_epc.size; + + dev = aml_device("EPC"); + aml_append(dev, aml_name_decl("_HID", aml_eisaid("INT0E0C"))); + aml_append(dev, aml_name_decl("_STR", + aml_unicode("Enclave Page Cache 1.0"))); + crs = aml_resource_template(); + aml_append(crs, + aml_qword_memory(AML_POS_DECODE, AML_MIN_FIXED, + AML_MAX_FIXED, AML_NON_CACHEABLE, + AML_READ_WRITE, 0, epc_base, + epc_base + epc_size - 1, 0, epc_size)); + aml_append(dev, aml_name_decl("_CRS", crs)); + + method = aml_method("_STA", 0, AML_NOTSERIALIZED); + aml_append(method, aml_return(aml_int(0x0f))); + aml_append(dev, method); + + aml_append(sb_scope, dev); + } aml_append(dsdt, sb_scope); /* copy AML table into ACPI tables blob and patch header there */